Scrapy - xpath 返回空列表

Question

我正在从 yelp 上抓取餐厅评论，特别是从这个 url

我正在尝试获取审阅容器的列表，并且在使用 chrome 控制台进行测试后，将由以下 xpath 表达式给出：

//li/div[@class='css-1qn0b6x']

但是，通过scrapy shell测试，以下命令返回一个空列表

response.xpath("//li/div[@class='css-1qn0b6x']").extract()

Answer 1

继续上面的评论，查看一个示例，了解如何通过首先从链接的原始页面的 HTML 中获取

yelp-biz-id

来收集评论：

import requests
from bs4 import BeautifulSoup
import pandas as pd

s = requests.Session()

url = 'https://www.yelp.it/biz/roscioli-roma-4'
headers = {"user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36"}

resp = s.get(url,headers=headers)
soup = BeautifulSoup(resp.text,'html.parser')
biz_id = soup.find('meta',{'name':'yelp-biz-id'})['content']

reviews = []
for page in range(5):

    api_url = f'https://www.yelp.it/biz/{biz_id}/review_feed?start={page*10}'
    resp  = s.get(api_url,headers=headers)
    
    data = resp.json()
    reviews = data['reviews']

    if resp.status_code == 200 and len(reviews) > 0:

        df = pd.json_normalize(reviews)
        reviews.append(df)

final_df = pd.concat(reviews).reset_index()
final_df